log²2(z)-4log2(z)+3 = 0
log2(z) = t
t²-4t+3 = 0
Так как a+b+c=0(1-4+3=0):
t1 = 1
t2 = c/a = 3
1)log2(z) = 1
z = 2¹ = 2
2)log2(z) = 3
z = 2³ = 8
